铁改性煤矸石去除废水中镉的研究  

Preparation of iron-modified coal gangue and removal of cadmium ions from wastewater

作　　者：白雪莉 蒲彦君 周建民 税永红[1] Bai Xueli;Pu Yanjun;Zhou Jianmin;Shui Yonghong(Key Laboratory of Solid Waste Ecological and Low Carbon Resource Utilization,Chengdu Textile College,Chengdu 611756;School of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000;School of Earth Science and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756)

机构地区：[1]成都纺织高等专科学校固体废物生态低碳资源化重点实验室,成都611756 [2]四川轻化工大学材料科学与工程学院,自贡643000 [3]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《化工新型材料》2024年第S01期272-277,284,共7页New Chemical Materials

基　　金：四川省科技计划项目(2021YFG0262);成都纺织高等专科学校人才资助项目(RCXM22003);成都纺织高等专科学校重点研发项目(2022fzlkb05)。

摘　　要：废水中的镉会严重威胁环境和人体健康。采用水热法制备铁改性煤矸石,并将其应用于含镉废水的处理。利用红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)、比表面积(BET)和Zeta电位等方法对材料的结构和表面性质进行分析,研究铁改性煤矸石对Cd^(2+)的吸附行为,考察了pH和共存离子等因素对其吸附性能的影响,探讨了其吸附动力学、吸附等温线。结果表明:铁改性煤矸石经改性后其比表面积提高了2.85倍,最佳反应pH为8,共存离子CO_(3)^(2-)、SO_(4)^(-)、F-促进吸附反应;据伪二级动力学和Freundlich吸附等温式,表明对Cd^(2+)的吸附是单分子层化学吸附,吸附过程是自发吸热过程;30℃和50℃时铁改性煤矸石对Cd^(2+)最大拟合吸附量分别为32mg/g和34.18mg/g。铁改性煤矸石对废水中的Cd^(2+)具有良好的吸附性,有望用于重金属离子废水的处理。Cadmium in wastewater can seriously threaten the environment and human health.In this paper,iron-modified coal gangue was prepared by hydrothermal method and applied for the treatment of wastewater containing cadmium.The structure and surface properties of the materials were analyzed by FT-IR,XRD,SEM,BET and zeta potential analysis.The adsorption behavior of iron-modified coal gangue for Cd^(2+)was studied.The effects of pH and coexisting ions on its adsorption performance were investigated.The adsorption kinetics and adsorption isotherms were discussed.The results showed that the specific surface area of iron-modified coal gangue was increased by 2.85 times after modification,the optimal reaction pH was 8,and the coexisting ions CO_(3)^(2-)、SO_(4) and F-promoted the adsorption reaction.According to pseudo second-order kinetics and Freundlich adsorption isotherm,the adsorption of Cd^(2+)was a monomolecular layer chemical adsorption,and the adsorption process was a spontaneous endothermic process.At 30℃and 50℃,the maximum fitted adsorption capacities of iron-modified coal gangue for Cd^(2+)were 32mg/g and 34.18mg/g,respectively.Iron-modified coal gangue had a good adsorption property for Cd^(2+)in wastewater,and was expected to be used in the treatment of wastewater with heavy metal ions.

关 键 词：煤矸石 改性 Cd2+ 吸附性能 吸附机理 

分 类 号：X703.5[环境科学与工程—环境工程]